COMPOSITION OF SOIL-FORMING MATERIALS 19 



TABLE VII. AMOUNT or SOLUBLE MATTER REMOVED IN THE 

 DECOMPOSITION or ROCKS AND THE FORMATION or SOILS 



formation of soils. Dissolved material may be washed 

 to the sea or into lakes, or it may simply be transferred to 

 lower lying soil and there often concentrated so highly 

 that it becomes injurious to plant growth. Some of these 

 dissolved materials, such as limestone, are not sufficiently 

 soluble to be troublesome even in the highest possible 

 concentrations. 



TABLE VIII. 



PERCENTAGE OF ALKALIES IN VARIOUS SOIL- 

 FORMING MINERALS 



